Concrete form



26, 1933. E. 'r. P. GREENIDGE CONCRETE FORM Filed March 25, 1930 2 Sheets-Sheet l Z. 7? P. Gavan/10:

jaw 36m aammq CONCRETE FORM Filed March 25, 1930 2 Sheets-Sheet 2 Patented Dec. 26, 1933 CONCRETE FORM' Ernest T. P. Greenidge, Huntington, IndL; Ray A. Miller, administrator of said Ernest T. P. Greenidge, deceased, assignor to Indiana Pipe Line 00., Huntington, Ind., a corporation of Indiana 7 Application March-25, 1930. Serial'No. 438,814

7 5 Claims.

This invention relates to concrete forms, and more particularly to such'forms for applying a coating of concrete to the outside of a pipe line or other cylindrical object.

5 The principal object of my invention, generally considered, is the application of a coating of concrete of generally uniform thickness to the outside of a pipe line for the purpose of increasing the strength and durability. of the'pipe.

9 Another object of my invention is the production of a steel form comprising 'hinged'sections which are adapted to embrace a pipe line, or section of pipe, leaving a space annular in section around said pipe for receiving concrete, for the purpose of coating the pipe with concrete.

A further object of my invention is the method )f applying a strengthening and preservative coating of concrete to the outside of a steel pipe line, involving the use of forms with hinged curved portions for embracing the pipewhereby the thickness of the coating applied to said pipe may be maintained substantially uniform.

A still further object of my invention is the 3 pended claims:-

with one embodiment of my place therearound.

Fig. 2 is a transverse section of the pipe and associated concrete form, showing the form in open position and before the concrete has been poured in place.

Fig.3 is a section similar to Fig. 2 showing the concrete in place.

Fig. 4 is a section similar to Fig. 3, but showing the form in closed position with-the concrete concrete form' in squeezed up over the top of the pipe to entirely cover it and illustrating the closing tool or toggle just after it has been used for closing the form. 1 Fig. 5 is a section similar to Fig. 4, but showing the closing toggle removed and the holding clips in place for holding the hinged sections of the form together.

Fig.6 is a section similar toFig. 5 showing the form detached from the coated pipe after the concrete has set.

by constructing a box square or rectangular in section around the pipe and filling it-with concrete. It will be readily appreciated that when Figure 1 is a side elevation of a section of pipe section 3 may have their leaves 11 extended Fig. '7 is a detail, on an enlarged scale, showing one typeof hinge used for connecting. the sections ofthe form together.

Fig. 8 is a side elevation of the hinge shown in Fig.7.

Referringto the drawings in detail, like parts being designated by like reference characters, there is illustrated a, pipe 1 preferably formed of steel andwhich maybe used for any desired purpose, for example, for the carrying of oil. It will-be'readily appreciated that such a pipe orv pipe linemay be buried in the ground and subject to soil corrosion, or, at any rate, is liable to rusting and. other atmosphericdeterioration. For the purpose of preserving the exterior of the pipe from such deterioration, as well as increasing the strength and durability thereof, I use concrete forms 2 which are first placed around the pipe, leaving a hollow cylindrical space therearound, or one annular in section, said spacebeing filled with concrete and allowed to set in place, after which the form is removed. In the past, pipe has been coated with concrete using such aform a great waste of concrete ensues'becauseit is impossibleto apply it to the pipe at a uniform thickness. v

For the purpose 'of applying the concrete to the outside of the pipe with practically no waste due to variation in thickness of'the concrete, I preferably construct my forms 2 in three parts, that is, an arcuate intermediate section .3wand sections 4 and 5 connected thereto on either side, as by means of hinges 6. All the sections-are desirably made of sheet steel with the edges flanged, as'indicated at 'I, for rigidifying the construction.

The intermediate or middle section 3 may be rigid and have an arcuate width of somewhat less than 180 so as to facilitate application and removal of the form with respect to the pipe 1. Inasmuch as the section 3 is preferably the largest section, itmay be I formed fromtwo flanged portions 8, with the adjoining flanges 9 connected together by means of rivets 10 providinga rigid structure. :The hinges 6 connecting the end sections 4 and 5 to the intermediate through slots 12 m the adjacent flanges '7 and riveted to the curved body portionsof the sections, as indicated most clearly in Fig; 1. If it is'desired to have the sections 3, 4 and 5 very close together, the slots in the flanges may be widened sufficiently to receive portions of the hinge hubs 13, as indicated most clearly in Figs. 7 and 8. The leaves 11 of the hinges are desirably connected to the adjacent sections by means of rivets or the like 14.

It will be understood that with my form, the concrete may be applied to the pipe while on skids over a ditch and subsequently lowered into the ditch. If desired, the concrete may be applied to the pipe in situ, the ditch in which the pipe is placed serving to permit the applica tion and removal of the forms. In order to hold the forms in place, I preferably employ selfcentering supports 15 which desirably consist of a T-iron 16 extending transversely of and above the pipe and angular clips 17, the horizontal legs 18 of which are desirably riveted to the T-iron 16 and the vertical legs 19 of which rest on the pipe 1 and thereby serve to support the T-iron 16 at the proper distance above the pipe. Connected to the T-iron adjacent the ends thereof are holding rings 20 for a purpose to be hereinafter explained.

The manner of application and use of my improved concrete form is desirably as follows: After the support 15 is in place, as shown in Fig. 2, the form 2 is applied beneath the pipe, as illustrated in the same figure, the sections 4 and 5 being opened or thrown back, as they are illustrated, to allow for the reception of the concrete 21, as shown in Fig. 3. Before pouring in the concrete, the form is desirably lined with tar paper 22 or the like to prevent the cement or concrete from sticking to the form and at the same time preventing leakage through the joints between the sections of the form and between the ends of adjacent forms. The form as shown in Fig. 2 is supportd from the T-irons 16, one of which is preferably provided at the end of each form, by hangers 23, the lower ends of which desirably hook through apertures 24 in the flanges '7 of the intermediate section 3 and the upper ends of which hook over the lower flange of the T-iron and are held in place by the holding rings or retainers 20, as shown most clearly in Fig. 3.

From a consideration of Fig. 1, it will be seen that the supports 15 serve to hold the ends of adjacent forms and are, therefore, positioned at the junctions between adjacent forms, it being understood that Fig. 1 is intended to represent one form with intermediate portions broken away and the right-hand end of an adjacent form, the adjoining ends of the adjacent forms being supported from the single T-iron 16. From this, it will be seen that the number of supports need exceed the number of forms by only one.

After the cement or concrete has been poured, as shown in Fig. 3, the form is closed, preferably by means of a closing tool or toggle 25, it being understood that the preliminary closing of the hinged or supplemental sections 4 and 5 may be by hand until they are close enough together to be engaged by the hooks 26 hinged on the handle or operating arm 27 of the toggle 25. In the present embodiment, the toggle is opened by movement of the handle counterclockwise, as viewed in Fig. 4,- and the hinged sections of the form are, therefore, drawn together by movement of the handle in the opposite direction. The closing toggle is used only to draw the hinged sections of the forms together a sufficient amount to permit the application of the connecting or holding clips 28 which are applied over and interlocking with the outstanding flanges on the being allowed to remain around the concrete.

It will be seen that as the only contact the form has with the pipe is through the vertical flanges 19 of the angular clip 17, only small holes are left in the concrete coating on removal of the forms, and these are desirably cemented shut after the forms have been removed.

From the foregoing disclosure, it will be seen that I have devised a set of concrete forms which permit the application of a specified thickness of concrete to a pipe line, or any other device having a circular section. The forms are self-centering and produce an approximatelyuniform thickness of the concrete coating, with the exception of the upper surface which is approximately horizontal. The deviation, however, from uniformity of thickness is practically negligible, so that the concrete is applied to the pipe with great efficiency and minimum wastage. The forms are easily applied and removed, and are made strong enough to prevent any bulging and thereby provide a coating which is in close contact with the pipe around the entire circumference. On account of the manner in which the forms are made and hinged together, they may be opened up and will drop away from the coating without pulling or dis- 7 turbing it in any way. In order to permit sufiii cient opening of the hinged sections of the form with respect to the intermediate section, the flanges on the hinged sections are desirably disposed at an angle to the radius or bent away from the adjacent flanges on the intermediate section whereby interference between the flanges does not occur even when the form is open to the extent shown in Fig. 2. The relative angularity of all the longitudinal flanges may be uniform.

In order to prevent longitudinal flow of a given 1 batch of concrete being poured, the open end of the form, or the annular space between the form and pipe may be closed by square packing or the like 29, of a size corresponding with the thickness of the concrete applied to the pipe, to thereby eifectively stop longitudinal leakage of the concrete. It will be understood, of course, that after one section 'of concrete is applied to the pipe, it seals against longitudinal flow of the concrete in the adjacent section so that it is only the other or free end of the new section that need be sealed by packing or the like.

As a non-limiting example of constructional details for a form for applying concrete to an 8 pipe, the length may be 8 and each form is desirably built from unit stampings of #14 U. S. Std. gauge steel 4 feet long with flanges around the entire periphery. The adjacent ends of longitudinal and transverse or arcuate flanges are desirably welded together. Adjacent transverse flanges of two stampingsare desirably con-- nected by rivets to provide the desired length of form. The supports may be 1 T's, 18" long, with 1% angle clips, 1 long. Using such forms, a substantially uniform coating of concrete of desired thickness, say from to 1", may be efficiently applied to the pipe. 1

Although I have described a preferred embodiment of my invention, it will be understood that the same is merely illustrative, andthat modifi- 150 Mil cations may be made within the spirit and scope of the appended claims.

I claim:

1. A form for concrete comprising supports with legs adapted to rest on a pipe and hangers depending from said supports, an arcuate section suspended from said hangers, and other arcuate sections hinged to the side edges of said firstmentioned section to substantially complete the closure of the pipe, leaving a hollow cylindrical space therearound for receiving a concrete coatmg.

2. A form for applying concrete to a pipe comprising generally horizontal supports With legs resting on the pipe, an arcuate section disposed beneath said supports, hangers with their top ends hooked over said supports and their bottom ends connected to the section, holding rings locking the top ends of said hangers to said supports, vand other arcuate sections hinged'to the side edges of the first-mentioned section to complete the enclosure of the pipe and provide a space around said pipe for receiving concrete.

3. Apparatus for applying a concrete coating to a pipe comprising a curved formsection adapted to extend around said pipe for less than 180,

' supports for said section comprising substantially edges of said curved form section and their upper ends engaging the ends of said supports, means locking said hangers to said supports, and other curved sections hinged to the side edges of the first-mentioned section and adapted to be swung toward said pipe after pouring concrete in said form to provide a space of substantially uniform thickness around said pipe forsaid concrete.

4. A form for concrete comprising a plurality of arcuate sections hinged together and adapted to be moved to position for enclosing a pipe, leaving a space therearound for receiving concrete, and means for supporting said form in position with respect to said pipe comprising a plurality of structural members with depending .flange portions resting on said pipe, and hangers extending from the ends of said members to an intermediate section of the form.

5. A form forconcrete comprising supports formed of structural members with legs resting on a pipe, an arcuate section disposed therebeneath, hangers suspending said section from said supports, other arcuate sections hinged to the side edges of said first-mentioned section for substantially completing the closure of the pipe,

leaving a hollow cylindrical space therearound for receiving concrete, and clips for holding the upper edges of the last-mentioned sections in place While the concrete is setting.

ERNEST T. 'P. GREENIDGE. 

